Wireworking machine



July 17, 1951 E. GUT

WIRE WORKING MACHINE Filed Dec. 2, 1948 Patented July 17, 1951 UNITED STATES FATENT OFFICE 1 Claim. 1

In high-speed wire working machines, such as presses for making pins and rivets, it is diificult to keep the Wear of moving parts within small limits, and to obtain a constantly reliable feed of the wire as well as certain ejection of the finished product and of any scrap. With the following arrangement and control of the ram slide and also the construction of feed device, described by way of example in a pin-making double-swaging press and illustrated in the drawing, these difficulties are to a large extent overcome, and at the same time a simple method of working of the machine is obtained.

Fig. 1 is a side view.

Fig. 2 a plan.

Fig. 3 a section of the line IIIIII of Fig. 2.

A ram slide 1 is movably guided between two cheeks 2 and 3 located parallel to each other and belonging to the fixed part of the machine. One end of the slide carries one or several dies l, whilst the other end, towards the cam shaft it, is swivellingly supported on a pin 5 of a rocking lever 6. The lever 6 is supported on an axle l on the machine frame. The cam discs 9 fitted on the shaft I0, which is rotatable in the bearings l l of the machine frame, operate, with their cams 9a and 917 through the rollers 8 rotatable on the pin 5, the swaging motions of the ram slide in the direction of the longitudinal axis. The end of the ram slide carrying one or more dies, is swung into and out of the swaging positions by the action of the cam disc 12 on the roller [3 of a twoarmed lever [4, which is under a constant counterpressure from the spring ll, through a rod 18, an intermediate piece It and a screw [5 arranged at the end of the lever I4.

With the rocking of the ram into the first swaging position, the nail cut off by the shearing device not illustrated in the drawing, and also any scrap adhering to the wire end produced, are ejected. In order to ensure stripping the scrap off, the axial return motion of the ram slide effected by a spring it supported on the machine frame, can be limited as desired by an adjustable eccentric 31, onto which the free end of the rocker 6 comes to lie; this is done in order that the face of the ram, while rocking into the first swaging position, can pass close to the end of the wire.

After the shaping of the nail head by the swaging motion of the ram, and after the complete rocking out of the ram from the second swaging position, the used wire is advanced the necessary distance for a new nail. This takes place, according to the invention, by means of two segments 22 and 23, oscillating round pivot pins and meshing with each other through their teeth 24, the distance between the pivot pins of these segments being adjustable in such a way that the segments, as described below, take hold of the wire led through between them during the forward stroke and let it free during the return stroke. The segment 22 is designed as a twoarmed lever and its oscillating motion, which is transmitted to the segment 23 by means of the 2 teeth 2 1, is received through the rod 26 reciprocated through rollers 21 by the cam 28. The segment 23 is with its pivot pin linked to an arm of a bellcrank lever 39. Along with the rocking of the bellcrank lever about its pin, which is effected by a cam 31 through the rollers 32 and the rod 33, the corresponding opening and closing of the shaper 2! takes place simultaneously with the control of the distance between the pivot pins of segments 23 and 22; the shaper 2| clamps the wire firmly during the swaging of the nail head and frees it during the feed.

In the segments 22 and 23 interchangeable inserts 25 are preferably provided, which on their sides facing the wire are formed according to the cross-section of the wire. These sides may, however, also be smooth, corrugated, roughened, or provided with transverse or longitudinal ribs in order to offer a suitable roughened surface to the shaft of the nail.

I claim:

In a wire working machine, such as a pin and rivet press for forming heads on pins or rivets in one or several swaging operations, a ram slide arranged slidably between two parallel cheeks, an upwardly extending lever pivotally mounted with its lower end to a stationary axle and carrying a pin on its upper end, said ram slide being supported with its end opposite the one performing the swaging operations on said pin, means including a rotatable cam for moving said slide lengthwise and also including means operating in predetermined relation to said cam for oscillating said ram slide about said pin to bring different portions of the end of the ram performing the swaging operation in alinement with the end of a workpiece to be provided with a head, a shaper engaging the workpiece adjacent the end on which the head is to be formed, and an adjustable stop for limiting the movement of the ram slide away from the workpiece in such a manner that the swaging face of the ram, during the motion of the latter passes close to the end of the workpiece projecting from said shaper, thereby stripping off any scrap clinging to the latter, said adjustable stop comprising a rotatably adjustable eccentric mounted on the frame of the machine, said upwardly extending lever being provided with an extension engaging said eccentric, and spring means urging said extension in continuous engagement with said eccentric.

EMIL GUT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

